A method of cable fault detection

Abstract

The application discloses a kind of cable fault detection methods, it is related to cable fault detection technical field, including based on the basic information of cable to be detected to determine division rule, cable detection model is established according to division rule;According to environmental basic information, environmental influence model is established;Based on cable detection model and environmental influence model, original cable space model is constructed, and transmitter and receiver are connected in the two ends of the cable to be detected according to the first direction, and first cable space model is obtained;Based on first cable space model, a plurality of first reflection signal information corresponding to microwave signal is determined;Transmitter and receiver are connected in the two ends of the cable to be detected according to the second direction, and the original cable space model is adjusted according to the second direction, and second cable space model is obtained;According to first fault point information and second fault point information, the fault point information of the cable to be detected is determined.The precision of fault point detection is improved, and the reliability of detection is guaranteed, so as to improve the stability of cable safe operation.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cable fault detection, and more particularly to a cable fault detection method. BACKGROUND

[0002] Cables are widely used in industrial production as one of the electrical equipment for transmitting power, signals and data. Due to the harsh working environment of the cable, it is easy to fail after a long time of use. In order to ensure the safety and reliable operation of the cable, cable detection becomes one of the necessary work. Cable fault diagnosis technology is a technology that uses the electrical and signal transmission characteristics of the cable to determine the fault location and type, mainly including frequency domain reflection method, time domain reflection method, electromagnetic wave method, etc. These technologies can comprehensively and accurately detect and diagnose the cable, providing important technical support for cable maintenance and repair. Microwave method: using the transmission characteristics and reflection characteristics of microwave, the change of reflected wave inside the cable is detected to determine whether the cable has a fault.

[0003] In the prior art, the microwave method for detecting cable faults is easily disturbed by external factors, resulting in inaccurate analysis of reflected waves, inaccurate detection of fault points, and reduced effectiveness of detection.

[0004] Therefore, how to improve the accuracy of fault point detection is a technical problem to be solved at present. SUMMARY

[0005] The present application provides a cable fault detection method to solve the technical problem of poor accuracy of fault point detection in the prior art. The method comprises:

[0006] Obtaining basic information of the cable to be detected, and determining a division rule based on the basic information of the cable to be detected, and establishing a cable detection model according to the division rule;

[0007] Obtaining environmental basic information, and establishing an environmental impact model according to the environmental basic information;

[0008] Based on the cable detection model and the environmental impact model, an original cable space model is constructed, a transmitter and a receiver are connected at both ends of the cable to be detected according to a first direction, and the original cable space model is adjusted according to the first direction to obtain a first cable space model, and a plurality of microwave signals with different intensities are sequentially transmitted;

[0009] Based on the first cable space model, a plurality of first reflected signal information corresponding to the microwave signal is determined, and first fault point information is determined according to the first reflected signal information;

[0010] According to a second direction, a transmitter and a receiver are connected at both ends of the cable to be detected, and the original cable space model is adjusted according to the second direction to obtain a second cable space model, and a plurality of microwave information with different intensities are sequentially transmitted;

[0011] determining a plurality of second reflected signal information corresponding to the microwave signal based on the second cable space model, and determining second fault point information according to the second reflected signal information;

[0012] determining the fault point information of the cable to be detected according to the first fault point information and the second fault point information.

[0013] In some embodiments of the present application, the division rule is determined based on the basic information of the cable to be detected, and the cable detection model is established according to the division rule, including:

[0014] finding the standard value closest to the basic information of the cable to be detected in the preset division table and calculating the deviation amount, so as to determine the division amount, wherein each basic information in the division table corresponds to a standard value, and a plurality of standard values correspond to a division amount;

[0015] If the deviation amount is zero, the division amount is directly determined according to the preset division table;

[0016] If the deviation amount is not zero, the total deviation amount is determined according to each deviation amount and the respective preset weight, and the division amount is determined based on the total deviation amount;

[0017] If part of the deviation amount is zero and the remaining part of the deviation amount is not zero, the part with zero deviation amount is recorded as the first part, and the part with non-zero deviation amount is recorded as the second part, the standard value corresponding to the first part and the total deviation amount corresponding to the second part are determined, the standard value and the total deviation amount are converted into intermediate values, and the division amount is determined according to the intermediate values;

[0018] The cable to be detected is divided into a plurality of sub-cables according to the division amount, and the transmission characteristic information of each sub-cable is established.

[0019] In some embodiments of the present application, the environmental basic information is obtained, and an environmental impact model is established according to the environmental basic information, including:

[0020] The environmental basic information includes environmental climate information and environmental terrain information;

[0021] The environmental climate information within the first distance of the cable to be detected and the environmental terrain information within the second distance of the cable to be detected are obtained, the influence amount of each environmental climate information is calculated, and the total influence amount of the environmental climate information is determined;

[0022] The environmental terrain information includes position information, building information and equipment information, the influence amount corresponding to each of the position information, the building information and the equipment information is calculated respectively, and the total influence amount of the environmental terrain information is determined, and the environmental impact amount is determined according to the total influence amount of the environmental climate information and the total influence amount of the environmental terrain information.

[0023] In some embodiments of the present application, before the environmental basic information is obtained, the method further includes:

[0024] The basic information of the cable to be detected includes a cable length;

[0025] The cable length and the division quantity are used to determine the sub-cable lengths at both ends of the cable and the average of the sub-cable lengths in the middle of the cable, and the first distance and the second distance are determined according to the size relationship between the sub-cable lengths at both ends of the cable and the average of the sub-cable lengths in the middle of the cable;

[0026] If the sub-cable lengths at both ends of the cable are both greater than the average of the sub-cable lengths in the middle of the cable, the first distance and the second distance are determined according to the difference between the sub-cable lengths at both ends of the cable and the average of the sub-cable lengths in the middle of the cable;

[0027] If the sub-cable lengths at both ends of the cable are both not greater than the average of the sub-cable lengths in the middle of the cable, the first distance and the second distance are determined according to the average of the sub-cable lengths in the middle of the cable;

[0028] If the sub-cable lengths at both ends of the cable are not the same, one is greater than the average of the sub-cable lengths in the middle of the cable and the other is not greater than the average of the sub-cable lengths in the middle of the cable, the first distance and the second distance are determined according to the average of the sub-cable lengths at both ends of the cable.

[0029] In some embodiments of the present application, an original cable space model is constructed based on a cable detection model and an environmental influence model, a transmitter and a receiver are connected at both ends of the cable to be detected in a first direction, and the original cable space model is adjusted according to the first direction to obtain a first cable space model, and a plurality of microwave signals with different intensities are sequentially transmitted, including:

[0030] The cable to be detected is projected as a line segment into space, the environmental basic information is restored to space according to the relative position of each environmental basic information and the cable to be detected, and the environmental influence and transmission characteristic information of each sub-cable are determined to obtain an original cable space model;

[0031] And the environmental influence and transmission characteristic information of each sub-cable are adjusted according to the first direction to obtain a first cable space model;

[0032] The transmitter sequentially transmits microwave signals with different intensities according to a preset change rule.

[0033] In some embodiments of the present application, a plurality of first reflection signal information corresponding to the microwave signals are determined based on the first cable space model, and first fault point information is determined according to the first reflection signal information, including:

[0034] The environmental influence and transmission characteristic information of each sub-cable adjusted according to the first direction are used to determine a plurality of first reflection signal information;

[0035] The first fault point information includes a first fault point position and a type;

[0036] determining the first fault point position and type according to the first reflection signal information.

[0037] In some embodiments of the present application, the transmitter and the receiver are connected at both ends of the cable to be detected according to the second direction, the original cable space model is adjusted according to the second direction to obtain a second cable space model, and a plurality of microwaves with different intensities are sequentially transmitted, including:

[0038] The environmental impact and transmission characteristic information of each sub-cable are adjusted according to the second direction to obtain the second cable space model, and the transmitter sequentially transmits microwave signals with different intensities according to a preset variation rule.

[0039] In some embodiments of the present application, a plurality of second reflection signal information corresponding to the microwave signals are determined based on the second cable space model, and second fault point information is determined according to the second reflection signal information, including:

[0040] The environmental impact and transmission characteristic information of each sub-cable are adjusted according to the second direction to obtain the second cable space model, and the transmitter sequentially transmits microwave signals with different intensities according to a preset variation rule.

[0041] The second fault point information includes the second fault point position and type.

[0042] The second fault point position and type are determined according to the second reflection signal information.

[0043] In some embodiments of the present application, before the first fault point information is determined according to the first reflection signal information or the second fault point information is determined according to the second reflection signal information, the method further includes:

[0044] A relationship curve between the microwave signal and the first reflection signal information is established, denoted as a first relationship curve, and a relationship curve between the microwave signal and the second reflection signal information is established, denoted as a second relationship curve.

[0045] An average value of the microwave signal intensity corresponding to the first direction is obtained, the first relationship curve is divided into a plurality of sub-curves according to the average value of the microwave signal intensity, and an average value of the slope of each sub-curve is calculated to obtain an average value of the slope of the first relationship curve.

[0046] An average value of the microwave signal intensity corresponding to the second direction is obtained, the second relationship curve is divided into a plurality of sub-curves according to the average value of the microwave signal intensity, and an average value of the slope of each sub-curve is calculated to obtain an average value of the slope of the second relationship curve.

[0047] If the average value of the slope of the first relationship curve and the average value of the slope of the second relationship curve satisfy a first preset corresponding relationship, the first fault point information is directly determined according to the first reflection signal information, or the second fault point information is determined according to the second reflection signal information.

[0048] If the average value of the slope of the first relationship curve and the average value of the slope of the second relationship curve do not satisfy the first preset corresponding relationship, the first relationship curve and the second relationship curve are divided into a plurality of sub-curves according to the average value of the microwave signal intensity corresponding to the first direction and the average value of the microwave signal intensity corresponding to the second direction, the similarity of each sub-curve corresponding to the first relationship curve and the second relationship curve is compared, the sub-curve with a similarity lower than a preset similarity threshold is screened out, the two sub-curves are adjusted according to the similarity threshold, and the corresponding positions in the first relationship curve and the second relationship curve are modified according to the adjusted two sub-curves. The first reflection signal information and the second reflection signal information at the corresponding positions are changed based on the adjusted first relationship curve and second relationship curve, and the first fault point information is determined according to the first reflection signal information, or the second fault point information is determined according to the second reflection signal information.

[0049] In some embodiments of the present application, the first fault point information and the second fault point information are used to determine the fault point information of the cable to be detected, which includes:

[0050] If the relationship between the first fault point position and the second fault point position satisfies the second preset corresponding relationship, the first fault point position or the second fault point position is taken as the fault point position of the cable to be detected;

[0051] If the relationship between the first fault point position and the second fault point position does not satisfy the second preset corresponding relationship, a third fault point position is found in the second preset corresponding relationship with the first fault point position as a reference, and the intermediate position between the third fault point position and the second fault point position is taken as the fault point position of the cable to be detected;

[0052] Or, if the relationship between the first fault point position and the second fault point position does not satisfy the second preset corresponding relationship, a third fault point position is found in the second preset corresponding relationship with the second fault point position as a reference, and the intermediate position between the third fault point position and the first fault point position is taken as the fault point position of the cable to be detected.

[0053] By applying the above technical solution, the basic information of the cable to be detected is obtained, and the division rule is determined based on the basic information of the cable to be detected. The cable detection model is established according to the division rule. The basic information of the environment is obtained, and the environmental influence model is established according to the basic information of the environment. The original cable space model is constructed based on the cable detection model and the environmental influence model. The transmitter and the receiver are connected at both ends of the cable to be detected according to the first direction, and the original cable space model is adjusted according to the first direction to obtain the first cable space model. A plurality of microwave signals with different intensities are sequentially transmitted. Based on the first cable space model, a plurality of first reflected signal information corresponding to the microwave signal is determined, and the first fault point information is determined according to the first reflected signal information. The transmitter and the receiver are connected at both ends of the cable to be detected according to the second direction, and the original cable space model is adjusted according to the second direction to obtain the second cable space model. A plurality of microwave signals with different intensities are sequentially transmitted. Based on the second cable space model, a plurality of second reflected signal information corresponding to the microwave signal is determined, and the second fault point information is determined according to the second reflected signal information. The fault point information of the cable to be detected is determined according to the first fault point information and the second fault point information. The present application establishes the cable detection model according to the division rule, and constructs the original cable space model according to the basic information of the environment. By comparing the change relationship between the microwave signal and the reflected wave signal information in different directions, the fault point information is determined. The accuracy of the fault point detection is improved, and the reliability of the detection is ensured, thereby improving the stability of the safe operation of the cable. BRIEF DESCRIPTION OF DRAWINGS

[0054] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0055] Figure 1 A flowchart of a cable fault detection method according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0056] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0057] An embodiment of the present application provides a cable fault detection method, as shown in Figure 1 The method comprises the following steps:

[0058] In step S101, basic information of the cable to be detected is acquired, and a division rule is determined based on the basic information of the cable to be detected, and a cable detection model is established according to the division rule;

[0059] In step S102, basic information of the environment is acquired, and an environmental influence model is established according to the basic information of the environment;

[0060] In step S103, an original cable space model is constructed based on the cable detection model and the environmental influence model, a transmitter and a receiver are connected at two ends of the cable to be detected in a first direction, and the original cable space model is adjusted according to the first direction to obtain a first cable space model, and a plurality of microwave signals with different intensities are sequentially transmitted;

[0061] In step S104, a plurality of first reflection signal information corresponding to the microwave signals is determined based on the first cable space model, and first fault point information is determined according to the first reflection signal information;

[0062] In step S105, a transmitter and a receiver are connected at two ends of the cable to be detected in a second direction, and the original cable space model is adjusted according to the second direction to obtain a second cable space model, and a plurality of microwave signals with different intensities are sequentially transmitted;

[0063] In step S106, a plurality of second reflection signal information corresponding to the microwave signals is determined based on the second cable space model, and second fault point information is determined according to the second reflection signal information;

[0064] In step S107, the fault point information of the cable to be detected is determined according to the first fault point information and the second fault point information.

[0065] In this embodiment, the greater the intensity of the transmitted microwave signal, the greater the intensity of the reflected wave signal, and the position and type of the cable fault can be determined by detecting the change in intensity and phase of the microwave reflected wave, which is the principle of microwave detection.

[0066] In this embodiment, the basic information of the cable to be detected includes cross-sectional shape, conductor size, insulating layer thickness, dielectric material, etc. The determination of the division rule means that the number of sub-cables is determined according to some basic information of the cable, which facilitates subsequent modeling and detection.

[0067] In this embodiment, the transmitter and the receiver are connected at two ends of the cable to be detected in the first direction or the second direction, and the first direction is opposite to the second direction, which refers to the positions of the transmitter and the receiver. For example, the transmitter is at the left end of the cable, and the receiver is at the right end of the cable, which is the first direction. The second direction is opposite to the first direction, that is, the transmitter is at the right end of the cable, and the receiver is at the left end of the cable. Conversely, the same applies. The transmitter refers to a microwave source, a device that transmits microwaves, and the receiver refers to a device that receives reflected microwave signals (transmitted wave signals).

[0068] In the embodiment, the first direction and the second direction are opposite, which causes the measured fault point positions to be relatively different, and the amplitude and phase of the reflected signal change: due to the positions of the exchanged transmitter and receiver, the propagation distance of the reflected signal changes, and the impedance characteristics change. Accordingly, the original cable spatial model needs to be adjusted.

[0069] In the embodiment, the reflected signal information includes information such as the strength and phase of the reflected signal, the second fault point information is determined according to the second reflected signal information, and the first fault point information is determined according to the first reflected signal information, which means that the position and type of the fault are determined according to the information such as the strength and phase of the reflected signal. For example, the reflected wave strength changes greatly, but the phase changes little, which may indicate that the cable has internal damage or insulation aging problems. While the reflected wave phase changes greatly, but the strength changes little, which may indicate that the joint has poor contact problems.

[0070] In the embodiment, the first fault point information or the second fault point information is not a certain point, but a detected fault point in the first direction detection, and is not limited to a single point.

[0071] The above scheme has the following beneficial effects: the application establishes a cable detection model according to the division rule, constructs an original cable spatial model according to the environmental basic information, and determines the fault point information by comparing the change relationship of the microwave signal and the reflected wave signal information in different directions. The accuracy of fault point detection is improved, and the reliability of detection is ensured, thereby improving the stability of cable safe operation.

[0072] In some embodiments of the cable fault detection method of the application, the division rule is determined based on the basic information of the cable to be detected, and the cable detection model is established according to the division rule, which includes:

[0073] In the preset division table, find the standard value closest to the basic information of the cable to be detected and calculate the deviation amount, so as to determine the division amount, wherein each basic information in the division table corresponds to a standard value, and a plurality of standard values correspond to a division amount;

[0074] If all the deviation amounts are zero, the division amount is directly determined according to the preset division table;

[0075] If all the deviation amounts are not zero, the total deviation amount is determined according to each deviation amount and the respective preset weight, and the division amount is determined based on the total deviation amount;

[0076] If part of the deviation amounts are zero and the remaining part of the deviation amounts are not zero, the part with zero deviation amount is recorded as a first part, and the part with non-zero deviation amount is recorded as a second part, the standard value corresponding to the first part and the total deviation amount corresponding to the second part are determined, the standard value and the total deviation amount are converted into an intermediate value, and the division amount is determined according to the intermediate value;

[0077] The to-be-detected cable is divided into a plurality of sub-cables according to the division quantity, and transmission characteristic information of each sub-cable is established.

[0078] In the embodiment, the deviation quantity refers to a difference between the basic information of each to-be-detected cable and the standard value.

[0079] In the embodiment, each total deviation quantity corresponds to a division quantity, and each intermediate value corresponds to a division quantity.

[0080] In the embodiment, the cable is divided into a plurality of small sections, each of which has its own impedance and transmission characteristic parameter, and the transmission characteristic information of each sub-cable refers to a transmission line equation which can describe a relationship between voltage and current on the cable and includes a series of partial differential equations and needs to be solved by a numerical method. This is a conventional technique in the art and will not be described here.

[0081] In the embodiment, the division quantity refers to a number of division of a cable, but the length of each sub-cable is not limited and can be adjusted or set according to actual conditions.

[0082] The above scheme has the beneficial effects that the deviation quantity is determined according to the basic information of the to-be-detected cable and the standard value, the division quantity is determined according to the deviation quantity or the standard value, the subsequent model is conveniently established, the detection accuracy is improved, and the reliability of internal signal propagation of the cable is ensured.

[0083] In some embodiments of the cable fault detection method, environment basic information is acquired, and an environment influence model is established according to the environment basic information, including:

[0084] The environment basic information includes environment climate information and environment terrain information.

[0085] The environment climate information within a first distance of the to-be-detected cable and the environment terrain information within a second distance of the to-be-detected cable are acquired, an influence quantity of each environment climate information is calculated, and a total influence quantity of the environment climate information is determined.

[0086] The environment terrain information includes position information, building information and equipment information, an influence quantity corresponding to each of the position information, the building information and the equipment information is respectively calculated, a total influence quantity of the environment terrain information is determined, and an environment influence quantity is determined according to the total influence quantity of the environment climate information and the total influence quantity of the environment terrain information.

[0087] In this embodiment, the environmental climate information includes climate information such as temperature and humidity of the environment surrounding the cable, the environmental terrain information includes location information of the cable in the air, under the sea, or on land, building information, and equipment information, and the material and height of the building: the material and height of the surrounding buildings will affect the propagation and attenuation characteristics of the microwave signal. There may be electromagnetic radiation sources in the surrounding equipment, such as communication base stations, radars, etc., which will generate strong electromagnetic fields and thus interfere with the microwave signal.

[0088] In some embodiments of the cable fault detection method of the present application, before obtaining the basic environmental information, the method further comprises:

[0089] The basic information of the cable to be detected includes the length of the cable;

[0090] Based on the length of the cable and the division quantity, the length of the sub-cable at both ends of the cable and the average length of the sub-cable in the middle of the cable are determined, and the first distance and the second distance are determined according to the size relationship between the length of the sub-cable at both ends of the cable and the average length of the sub-cable in the middle of the cable;

[0091] If the length of the sub-cable at both ends of the cable is greater than the average length of the sub-cable in the middle of the cable, the first distance and the second distance are determined according to the difference between the length of the sub-cable at both ends of the cable and the average length of the sub-cable in the middle of the cable;

[0092] If the length of the sub-cable at both ends of the cable is not greater than the average length of the sub-cable in the middle of the cable, the first distance and the second distance are determined according to the average length of the sub-cable in the middle of the cable;

[0093] If the length of the sub-cable at one end of the cable is greater than the average length of the sub-cable in the middle of the cable, and the length of the sub-cable at the other end is not greater than the average length of the sub-cable in the middle of the cable, the first distance and the second distance are determined according to the average length of the sub-cable at both ends of the cable.

[0094] In this embodiment, the cable at both ends is connected to a receiver and a transmitter, so the length of the sub-cable at both ends is related to the influence of the surrounding environment. The length of the sub-cable at both ends of the cable refers to the length of the first sub-cable at both ends.

[0095] In this embodiment, the difference between the length of the sub-cable at each end of the cable and the average length of the sub-cable in the middle of the cable corresponds to the first distance and the second distance, the average length of the sub-cable in the middle of each cable corresponds to the first distance and the second distance, and the average length of the sub-cable at both ends of each cable corresponds to the first distance and the second distance.

[0096] In some embodiments of the cable fault detection method, an original cable space model is constructed based on a cable detection model and an environmental influence model, a transmitter and a receiver are connected at two ends of a to-be-detected cable in a first direction, the original cable space model is adjusted according to the first direction to obtain a first cable space model, and a plurality of microwave signals with different intensities are sequentially transmitted, including:

[0097] The to-be-detected cable is projected as a line segment into space, the environmental basic information is restored to space according to the relative position of each environmental basic information and the to-be-detected cable, and the environmental influence amount and the transmission characteristic information of each sub-cable are determined to obtain an original cable space model.

[0098] The environmental influence amount and the transmission characteristic information of each sub-cable are adjusted according to the first direction to obtain a first cable space model.

[0099] The transmitter sequentially transmits microwave signals with different intensities according to a preset change rule.

[0100] In some embodiments of the present application, a plurality of first reflection signal information corresponding to the microwave signal is determined based on the first cable space model, and first fault point information is determined according to the first reflection signal information, including:

[0101] The environmental influence amount and the transmission characteristic information of each sub-cable adjusted according to the first direction are used to determine a plurality of first reflection signal information.

[0102] The first fault point information includes the first fault point position and the type.

[0103] The first fault point position and the type are determined according to the first reflection signal information.

[0104] In this embodiment, the environmental basic information is restored to space according to the relative position of each environmental basic information and the to-be-detected cable, which means that the real position of each influencing factor in the environment is restored, and the influence of each influencing factor on each sub-cable is determined. In order to correct the transmission characteristic information according to the influence amount subsequently. The second reverse is the same.

[0105] In this embodiment, the preset change rule of the first direction and the second direction is the same, for example, increasing or decreasing at a certain fixed speed, and the change of the corresponding reflection wave intensity is compared to reduce interference.

[0106] In this embodiment, the first cable space model determines a plurality of first reflection signal information corresponding to the microwave signal, and the second cable space model determines a plurality of second reflection signal information corresponding to the microwave signal, which means that the reflection signal information is corrected after the influence amount, and the influence amount of each sub-cable is combined to correct the reflection signal of the whole cable.

[0107] In the embodiment, sequentially transmitting the microwave signals refers to transmitting the microwave signals, receiving the reflected wave signals by the receiver and completing analysis, and then the next transmission can be performed.

[0108] In some embodiments of the present application, the transmitter and the receiver are connected at two ends of the cable to be detected according to the second direction, the original cable space model is adjusted according to the second direction to obtain a second cable space model, and a plurality of microwave signals with different intensities are sequentially transmitted, including:

[0109] The environmental impact and transmission characteristic information of each sub-cable are adjusted according to the second direction to obtain the second cable space model, and the transmitter sequentially transmits microwave signals with different intensities according to a preset variation rule.

[0110] In some embodiments of the present application, a plurality of second reflected signal information corresponding to the microwave signals are determined based on the second cable space model, and second fault point information is determined according to the second reflected signal information, including:

[0111] The environmental impact and transmission characteristic information of each sub-cable are adjusted according to the second direction to obtain the second cable space model, and the transmitter sequentially transmits microwave signals with different intensities according to a preset variation rule.

[0112] The second fault point information includes the second fault point position and type.

[0113] The second fault point position and type are determined according to the second reflected signal information.

[0114] In some embodiments of the present application, before the first fault point information is determined according to the first reflected signal information or the second fault point information is determined according to the second reflected signal information, the method further includes:

[0115] A relationship curve diagram of the microwave signals and the first reflected signal information is established, denoted as a first relationship curve, and a relationship curve diagram of the microwave signals and the second reflected signal information is established, denoted as a second relationship curve.

[0116] An average value of the microwave signal intensity corresponding to the first direction is obtained, the first relationship curve is divided into a plurality of sub-curves according to the average value of the microwave signal intensity, and an average value of the slope of the first relationship curve is calculated based on the average value of the slope of each sub-curve.

[0117] An average value of the microwave signal intensity corresponding to the second direction is obtained, the second relationship curve is divided into a plurality of sub-curves according to the average value of the microwave signal intensity, and an average value of the slope of the second relationship curve is calculated based on the average value of the slope of each sub-curve.

[0118] If the average value of the slope of the first relationship curve and the average value of the slope of the second relationship curve satisfy a first preset corresponding relationship, the first fault point information is directly determined according to the first reflected signal information, or the second fault point information is determined according to the second reflected signal information.

[0119] If the average value of the slope of the first relationship curve and the average value of the slope of the second relationship curve do not satisfy the first preset corresponding relationship, the first relationship curve and the second relationship curve are divided into a plurality of sub-curves according to the average value of the microwave signal intensity corresponding to the first direction and the average value of the microwave signal intensity corresponding to the second direction, the similarity of each sub-curve corresponding to the first relationship curve and the second relationship curve is compared, the sub-curves with a similarity lower than a preset similarity threshold are screened out, the two sub-curves are adjusted according to the similarity threshold, and the corresponding positions in the first relationship curve and the second relationship curve are modified according to the adjusted two sub-curves, the first reflected signal information and the second reflected signal information at the corresponding positions are changed based on the adjusted first relationship curve and the second relationship curve, and the first fault point information is determined according to the first reflected signal information, or the second fault point information is determined according to the second reflected signal information.

[0120] In the embodiment, the first preset corresponding relationship is a corresponding relationship of two average values of slopes set in advance. For example, the average value x1 of the slope corresponds to the average value x2 of the slope.

[0121] In the embodiment, the similarity of the sub-curves is the similarity of the smoothness or the bending degree of the two corresponding curves.

[0122] In the embodiment, the first relationship curve refers to the change of the intensity of the reflected wave with the microwave signal intensity and the change of the phase of the reflected wave with the microwave signal intensity, that is, two curves. The second relationship curve is the same.

[0123] In the embodiment, adjusting the two sub-curves according to the similarity threshold means that the positions where the two sub-curves are not similar are moved to the middle position.

[0124] In some embodiments of the cable fault detection method, the first fault point information and the second fault point information are used to determine the fault point information of the cable to be detected, which includes:

[0125] If the relationship between the first fault point position and the second fault point position satisfies the second preset corresponding relationship, the first fault point position or the second fault point position is taken as the fault point position of the cable to be detected;

[0126] If the relationship between the first fault point position and the second fault point position does not satisfy the second preset corresponding relationship, the third fault point position is found in the second preset corresponding relationship with the first fault point position as the reference, and the middle position between the third fault point position and the second fault point position is taken as the fault point position of the cable to be detected;

[0127] Or, if the relationship between the first fault point position and the second fault point position does not satisfy the second preset corresponding relationship, the third fault point position is found in the second preset corresponding relationship based on the second fault point position, and the intermediate position between the third fault point position and the first fault point position is taken as the fault point position of the cable to be detected.

[0128] In the embodiment, the second preset corresponding relationship means that the first fault point position and the second fault point position satisfy the corresponding relationship. In fact, if the fault point detected in the first direction and the fault point detected in the second direction have the same result, the first fault point position and the second fault point position are the same position on the cable, only the relative positions are different.

[0129] By applying the above technical solution, the basic information of the cable to be detected is obtained, and the division rule is determined based on the basic information of the cable to be detected. The cable detection model is established according to the division rule. The environmental basic information is obtained, and the environmental influence model is established according to the environmental basic information. The original cable space model is constructed based on the cable detection model and the environmental influence model. The transmitter and the receiver are connected at both ends of the cable to be detected in the first direction, and the original cable space model is adjusted according to the first direction to obtain the first cable space model. A plurality of microwave signals with different intensities are sequentially transmitted. Based on the first cable space model, a plurality of first reflection signal information corresponding to the microwave signal is determined, and the first fault point information is determined according to the first reflection signal information. The transmitter and the receiver are connected at both ends of the cable to be detected in the second direction, and the original cable space model is adjusted according to the second direction to obtain the second cable space model. A plurality of microwave information with different intensities are sequentially transmitted. Based on the second cable space model, a plurality of second reflection signal information corresponding to the microwave signal is determined, and the second fault point information is determined according to the second reflection signal information. The fault point information of the cable to be detected is determined according to the first fault point information and the second fault point information. The cable detection model is established according to the division rule, and the original cable space model is constructed according to the environmental basic information. The change relationship between the microwave signal and the reflection wave signal information in different directions is compared to determine the fault point information. The accuracy of the fault point detection is improved, and the reliability of the detection is ensured, thereby improving the stability of the safe operation of the cable.

[0130] Through the description of the above embodiments, those skilled in the art can clearly understand that the present application can be implemented by hardware, or by means of software and necessary general hardware platform. Based on such understanding, the technical solutions of the present application can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a U disk, a mobile hard disk, etc.), and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in various implementation scenarios of the present application.

[0131] It should be noted that the above examples are only used to illustrate the technical solutions of the present application, and are not intended to limit the same. Although the present application has been described in detail with reference to the foregoing examples, those skilled in the art will understand that modifications can be made to the technical solutions described in the foregoing examples, or some of the technical features thereof can be replaced by equivalent features, and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method of cable fault detection, characterized by, The method comprises: Obtaining basic information of the cable to be detected, and determining a division rule based on the basic information of the cable to be detected, and establishing a cable detection model according to the division rule; Obtaining basic information of the environment, and establishing an environmental impact model according to the basic information of the environment; Based on the cable detection model and the environmental impact model, an original cable space model is constructed, a transmitter and a receiver are connected at both ends of the cable to be detected in a first direction, and the original cable space model is adjusted according to the first direction to obtain a first cable space model, and a plurality of microwave signals with different intensities are sequentially transmitted; Based on the first cable space model, a plurality of first reflected signal information corresponding to the microwave signals is determined, and first fault point information is determined according to the first reflected signal information; A transmitter and a receiver are connected at both ends of the cable to be detected in a second direction, and the original cable space model is adjusted according to the second direction to obtain a second cable space model, and a plurality of microwave signals with different intensities are sequentially transmitted; Based on the second cable space model, a plurality of second reflected signal information corresponding to the microwave signals is determined, and second fault point information is determined according to the second reflected signal information; The fault point information of the cable to be detected is determined according to the first fault point information and the second fault point information; And based on the basic information of the cable to be detected, a division rule is determined, and a cable detection model is established according to the division rule, including: finding the standard value closest to the basic information of the cable to be detected in the preset division table and calculating the deviation amount, so as to determine the division amount, wherein each basic information in the division table corresponds to a standard value, and a plurality of standard values correspond to a division amount; If the deviation amount is zero, the division amount is directly determined according to the preset division table; If the deviation amount is not zero, the total deviation amount is determined according to each deviation amount and the corresponding preset weight, and the division amount is determined based on the total deviation amount; If part of the deviation amount is zero and the remaining part of the deviation amount is not zero, the part with zero deviation amount is recorded as the first part, and the part with non-zero deviation amount is recorded as the second part, the standard value corresponding to the first part and the total deviation amount corresponding to the second part are determined, the standard value and the total deviation amount are converted into intermediate values, and the division amount is determined according to the intermediate values; According to the division amount, the cable to be detected is divided into a plurality of sub-cables, and the transmission characteristic information of each sub-cable is established; Obtaining basic information of the environment, and establishing an environmental impact model according to the basic information of the environment, including: the basic information of the environment includes environmental climate information and environmental terrain information; Obtaining environmental climate information within a first distance of the cable to be detected and environmental terrain information within a second distance of the cable to be detected, calculating the influence amount of each environmental climate information, and thus determining the total influence amount of the environmental climate information; The environmental terrain information includes position information, building information and equipment information, the influence amount corresponding to each of the position information, the building information and the equipment information is calculated respectively, and thus the total influence amount of the environmental terrain information is determined, and the environmental impact amount is determined according to the total influence amount of the environmental climate information and the total influence amount of the environmental terrain information; The original cable space model is constructed based on a cable detection model and an environmental influence model, a transmitter and a receiver are connected at two ends of the cable to be detected in a first direction, the original cable space model is adjusted according to the first direction, a first cable space model is obtained, and a plurality of microwave signals with different intensities are sequentially transmitted, including: projecting the cable to be detected as a line segment into space, restoring the environmental basic information to space according to the relative position of each environmental basic information and the cable to be detected, and determining the environmental influence and transmission characteristic information of each sub-cable to obtain the original cable space model; and the environmental influence and transmission characteristic information of each sub-cable are adjusted according to the first direction to obtain the first cable space model; The transmitter sequentially transmits microwave signals with different intensities according to a preset change rule; A transmitter and a receiver are connected at two ends of the cable to be detected in a second direction, the original cable space model is adjusted according to the second direction, a second cable space model is obtained, and a plurality of microwave signals with different intensities are sequentially transmitted, including: adjusting the environmental influence and transmission characteristic information of each sub-cable according to the second direction to obtain the second cable space model, and the transmitter sequentially transmits microwave signals with different intensities according to a preset change rule.

2. The cable fault detection method of claim 1, wherein, Before obtaining the environmental basic information, the method further includes: the cable basic information includes the cable length; Based on the cable length and the division amount, the lengths of the sub-cables at both ends of the cable and the average length of the sub-cables in the middle of the cable are determined, and the first distance and the second distance are determined according to the size relationship between the lengths of the sub-cables at both ends of the cable and the average length of the sub-cables in the middle of the cable; If the lengths of the sub-cables at both ends of the cable are both greater than the average length of the sub-cables in the middle of the cable, the first distance and the second distance are determined according to the difference between the lengths of the sub-cables at both ends of the cable and the average length of the sub-cables in the middle of the cable; If the lengths of the sub-cables at both ends of the cable are both not greater than the average length of the sub-cables in the middle of the cable, the first distance and the second distance are determined according to the average length of the sub-cables in the middle of the cable; If the lengths of the sub-cables at both ends of the cable are one greater than the average length of the sub-cables in the middle of the cable and the other not greater than the average length of the sub-cables in the middle of the cable, the first distance and the second distance are determined according to the average length of the sub-cables at both ends of the cable.

3. The cable fault detection method of claim 1, wherein, Based on the first cable space model, a plurality of first reflection signal information corresponding to the microwave signal is determined, and first fault point information is determined according to the first reflection signal information, including: determining a plurality of first reflection signal information according to the environmental influence and transmission characteristic information of each sub-cable adjusted in the first direction; The first fault point information includes the first fault point position and type; and the first fault point position and type are determined according to the first reflection signal information.

4. The cable fault detection method of claim 1, wherein, Based on the second cable space model, a plurality of second reflection signal information corresponding to the microwave signal is determined, and second fault point information is determined according to the second reflection signal information, including: determining a plurality of second reflection signal information according to the environmental influence and transmission characteristic information of each sub-cable adjusted in the second direction; The second fault point information includes the second fault point position and type; and the second fault point position and type are determined according to the second reflection signal information.

5. The cable fault detection method of claim 3 or 4, wherein, Before determining the first fault point information according to the first reflection signal information or determining the second fault point information according to the second reflection signal information, the method further comprises: establishing a relationship curve diagram of the microwave signal and the first reflection signal information, denoted as a first relationship curve, and establishing a relationship curve diagram of the microwave signal and the second reflection signal information, denoted as a second relationship curve; an average value of the microwave signal intensity corresponding to the first direction is obtained, and the first relationship curve is divided into a plurality of sub-curves according to the average value of the microwave signal intensity, and an average value of the slope of each sub-curve is calculated to obtain an average value of the slope of the first relationship curve; an average value of the microwave signal intensity corresponding to the second direction is obtained, and the second relationship curve is divided into a plurality of sub-curves according to the average value of the microwave signal intensity, and an average value of the slope of each sub-curve is calculated to obtain an average value of the slope of the second relationship curve; if the average value of the slope of the first relationship curve and the average value of the slope of the second relationship curve satisfy a first preset corresponding relationship, the first fault point information is directly determined according to the first reflection signal information, or the second fault point information is determined according to the second reflection signal information; if the average value of the slope of the first relationship curve and the average value of the slope of the second relationship curve do not satisfy the first preset corresponding relationship, the first relationship curve and the second relationship curve are divided into a plurality of sub-curves according to the average value of the microwave signal intensity corresponding to the first direction and the average value of the microwave signal intensity corresponding to the second direction, the similarity of each sub-curve corresponding to the first relationship curve and the second relationship curve is compared, the sub-curve with a similarity lower than a preset similarity threshold is screened out, the two sub-curves are adjusted according to the similarity threshold, the corresponding positions in the first relationship curve and the second relationship curve are modified according to the adjusted two sub-curves, the first reflection signal information and the second reflection signal information at the corresponding positions are changed based on the adjusted first relationship curve and the adjusted second relationship curve, and then the first fault point information is determined according to the first reflection signal information, or the second fault point information is determined according to the second reflection signal information.

6. The method of cable fault detection of claim 5, wherein, The fault point information of the to-be-detected cable is determined according to the first fault point information and the second fault point information, comprising: if the relationship between the first fault point position and the second fault point position satisfies a second preset corresponding relationship, the first fault point position or the second fault point position is taken as the fault point position of the to-be-detected cable; if the relationship between the first fault point position and the second fault point position does not satisfy the second preset corresponding relationship, a third fault point position is found in the second preset corresponding relationship with the first fault point position as a reference, and the intermediate position between the third fault point position and the second fault point position is taken as the fault point position of the to-be-detected cable; or, if the relationship between the first fault point position and the second fault point position does not satisfy the second preset corresponding relationship, a third fault point position is found in the second preset corresponding relationship with the second fault point position as a reference, and the intermediate position between the third fault point position and the first fault point position is taken as the fault point position of the to-be-detected cable.

Images